Adding attachment for type-writers.



0. H. GILL.

ADDINGATTAGHEENT FOB TYPE WRITERS.

APPLICATION FILED NOV. 16, 190B.

atented June 15, 1909.

5 SHEETS-SHEET 1.

c. H. GILL.

ADDING ATTACHMENT FOB. TYPBWBITBRS.

APPLICATION I ILBD NOV. 16, 1908. v

Patented June 15, 1909,

a sums-sum 2.

Witnesses;

0. H. GILL.

ADDING ATTACHMENT r011 TYPE WRITERS. APPLICATION FILED HOV. 16, 1908.

924,759 Patented June 15, 1909.

6 SHEETS-SHEET 3.

G. H. GILL.

ADDING ATTACHMENT FOB. TYPE WRITERS.

APPLIOATIOH FILED NOV. 16, 1808.

Patented Julie 15,1909.

a sums-sum 4.

v 0. H. GILL.

ADDING} ATTACHMENT FOB TYPE WRITERS.

APPLIOATIOIY FILED NOV. 16, 1908. ggfiwu Patented Jams 15, 1909.

6 SHEETS-SHEET 5.

m m @140 3/ a 55 tive of an CHARLES H. GILL, OF CHICAGO, ILLINOIS,

DALL, OF CHICAGO, ILLIN ILLINOIS.

ill

Oi. ONE-FOURTH TO ROY 0. RA 'lO RAUS RIOHEY, OF STRONGHURST,

ADDZNG ATTAGTZMENT FOR TYPE-WRITERS.

Application filed November 16, 1908.

Specification of Letters Patent.

Patented June 15, 1909. Serial No. 4152330.

To all wizontit may con-cam.

it lmown that l, (n.autns l GILL, a citizen of the United Stirtcs of In co, and s. resident of Chicago, Cool; Ststc of Illincds, have invented cort no and uscful lmpiovcincnts in "idd hruonts to r Tlypollritcrs, ol which specification.

Tho main objccts ol. this invention are to providc improved, simple and inexpensive form of adding mechanism particularly adapted for ottochmont to typewriters; to provide a dovico of this class which may ho readily adopted to L1 0. prcscnt construction of standard makes of typewriters without requiring rearrangement of the ports thercof to provide, in s device of this class, im orovod moans independent of tho typowritcr orris for automatically causing the numcral keys which are successively depressed in writing a number to successively opcro-to tho proper denomination wheels ol' tho adding mechanism; to provide on i in provcd lornrof carriage and cscspomcnt mechanism for adding devices, whercby the wheels will be prcvented from m crrunning or from occidentolly tur. ing back through sudden or violent operation of tho operating nlOi llalll Slll; to provide on improved urrnngcmcnt \vhcroby 80 the ridding mechanism will, at the will of the operator, add numbors which are successively written, rogsrdlcss of the position of such numbers on the sheet which is being written, or regardless of whothor tho numolunms or in rows, and ny special setting of the adding mechanism with rospcrt to the typewritor carriage; to provide imprm'cd mechanism for causing thc shifting of tho udder 0 corriago by means of tho space bar oi tho typewriter as well as by the numeral keys; to provide improved and simple moons for throwing tho adding mcchsnism into and out of operation; to provide simple n'iochanism 5 for causing the adding mechanism to operate in a reverse direction for subtracting,- snd to provide improved means for causing the numcrslkeys to rotate the computing wheels proportionately to the number of units in the numerals to which the rsspcctive keys correspond.

These objects are accomplished by the dcvicc shown in the accompanying drawings, in which: Figure 1 is an isometric perspecadding attachment for typewriters Without requiring a l l l l l l l l l l i embodying this invention, the ironic and mcchsnism of tho typo-writer being omitted for the purpose of clearly showing the relation of .hcvsrious ports of the attachment to catch othcr. 2 is front elevation of tho some, sl'iowing its position with respect to tho koybonrd'of the typewriter. Fig. 3 is s plan of the some, the keyboard of the typcwritcr being included, but the remaining parts of the typewriter mechanism being .65 omitted. Fig. 4 is :1 section'on the line 44 of Fig. 2. Fig. 5 is a detail of one of the trains of gears by means of which the count is carried from one computing whcel to anotlior of the next higher denomination. Fig. 6 is o sidc elevation of tho some, showing tho position of the ports within the casing. Fig. 7 is a section on the line 7*? of Fig. Fig.

8 is a detail of the mechanism the movcmcnt of the most thereby prevents "overthrow puting wheels.

1n. the drawings, the numerals 1, 2, etc., to 0 designate tho keys which when depressed cause the rospo tivo numerals to be written 8 by the typewriter; 10 designates the key lovers; 1], the typewriter frame; 12, the? typewriter carriage as a whole; and 13, the spore key or bar.

In tho construction shown in tho draw ings, the computing wheels 14 are loosely journolod on o fixed shaft 15 in the casing 16,-whioh casing is mounted upon a carriage 17 which is in. the form of o bar slidably mounted in suitoile supports on the typowritor frame. The carriage 17 is normally urged toward tho loft-hand limit of its move ment by moons of a spring 18, and is providcd with a knob 1.0 whereby it may be pushed toward the right against the action 9 of said spring. The range of movement of the bar 17 depends upon the number of computing wheels 14 which are provided in the adder attu hmcnt, and the movement of the adder carriage 17 is controlled by an cscopomcnt 20 in a manner somewhat similar to typewriter carriage. Tho

which limits or pinion and 75 of the comthe control of :1 specific escopcmcnt mechanism is, however, dill'orent, as will hereinafter appear.

The oscspement 20 is in the form of u pawl carried by the shaft 2] and udoptcd to rock so as to alternately cngago the rack tooth 22 and 23 at respectively opposite sides of the bar 17. The teeth 22 and 23 are in singgcrcd relation to each othcr. An arm 24 secured to the shaft 21 slidably engages a .41 the upper limit oi its movement, thus normally hold the pawl 20 in the position shown in Fig. 1.

The teeth 22 on the adder carriage correspond to the successive positions of said-carriage which will bring successive computing wheel gears into mesh with the master pinion 30 by means of which the computing mechanism is operated. In the form shown, the master pinion 30 is fixed upon a shaft 31 journaled in the supporting frame and provided with a second pinion 32 which extends through an aperture 33 in the operating member 34. The operating member 34 is vertically disposedand is provided with rack teeth 35 at opposite sides of the apertu're 33. The two sets of rack teeth are spaced apart so that but one at a time may mesh with the teeth of the pinionjlQ. The lower end of themember 34 pivotally connected with a second swinging frame or meme,

ber 36 normally urged upward by springs 37.

The upper end of the operating member 34 is guided between rollers 38 journaled upon a slide 39 having a transverse movement sufficient to carry either set of rack teeth on the member 34 into mesh with the pinion 32.

' The slide 39 is normally urged by a spring 40 ,so as to hold the member 34 in such position that it will rotate the pinion 30 in the direction for increasing the count of the computing wheels during the downward stroke of the member 36. A pivoted detent lever 41 is provided for holding the slide 39 at thc opposite limit of its movement, so that the downward movement of the member 34 will rotate the pinion 30 in the direction for reducing the count of the computing wheels during the downward movement of the member 36. Theslide 39 and detentlever 41 are provided with coactingshoulders 42 for this purpose. The s )ring 43 normally urges the lever 41 upwardi 42 will engage when the slide 39 is pushed back into the subtracting position.

In order that the different numeral key levers will each depress the member 36 to a different extent so as to cause a movement of the computing wheels proportionate to the number of units in the respective numerals which anebeing, written, said frame 36 ,is provided with a series of upright rods 44 of successively difl'erent lengths so that y so that the shoulders.

their upper ends serve as shoulders'against which the corresponding key lever 10 may abut. The length of the rods 44 is so proportioned that the key lever 10 which corres onds tc-the numeral 1 will, when depressed t 1e full limit of its movement, cause the master pinion 30 to rotate through one unit angular interval so that it will rotate the computing wheel withwhich it is connected enough to change its count by unity. Similarly, the key lever 10 which corresponds to the key of the numeral 9 will rotate the pinion 30 through nine unit intervals.

The member 36 has no rod 44 in osition for engaging the zero key, so that w en 0 is written by the typewriter the count of the computing wheels will remain unchanged. In order to cause the adder carriage to shift after the writing of each numeral, so that the various numerals of which a number is composed will be added to or subtracted from the countof the proper denomination wheel, the member 26 which operates the esca enient of the adder carriage is provided wit a series of rods 45, one for each key lever 10. including that of the numeral 0. These rods 45 are all of the same length. The member 26 is also connected with the s ace bar 13 so to be operated thereby. n the form shown, this connection consists of a system of lovers 46 and 47 which-are operated by the lever 48 which carries the space bar 13;

The carrying of the count from; one computing wheel 14 to the next is accomplished by means of a trainjof gears comprising a gear 49 secured against the left-hand face oi each counting wheel 14, a gear 50 of considerably smaller diameter than the gear 49 secured to the right-hand face of each computing wheel 1 4, and gears 51 and .52 which are journaled in fixed relation to each other and which respectively mesh with the gears 49 and 50. in the form shown, the gears 49 and 51 are of equal diameters, so that the gear 51 will make one revolution for each revolution oi 'ts' corresponding computing wheel 14. The gear 52 is a mutilated gear provided with a single tooth 53, but the itch diameter of the mutilated gear 52 is such that the toothed part oi its periphery will move through such angular interval during each one-tenth of a revolution of the gear 52, that it will never StCf) in position to interfere with the free rotaaon of the corresponding gear 50. This is illustrated in Fig. 6, where the tooth 53 is shown by full lines in a position clear ofthe teeth of the gear '50 and by dotted lines in its succeeding position, where it will also be clear of the gear 50 al'ter having rotated said gear 50 through an angular interval of onetenth of 'a revolution, corresponding to the unit interval of movement or puting wheel 14.

In order to insure that the numerals on the the respective comi overthrou of l e in N13 proper column. As lhe sjmee h; r 13 computing wheels and insure ll oi; the inasie also operzil'es the adder carriage, said earpinion 30 will be positively looked after if has riuge would simul:uneously shill. so lhzit The registered the proper amount upon the (0117* pinion 3G would mesh Willi i'hogezir train of puting Wheels, detour 63 isslidohly mounlthe computing wheel of the corresponding edupon thesupporiiug frame and iouueoi'od denorniuzrtiou. if, for example, the operiu 3* a link with tho mernlz-or 2o that K tor wishes to write the number 160; :LflOl when said memher is of its lower rimi of l sellingthetypewritercarriageandl he-iddor d detenl 63 Will l )iniou 32 and look it o oiiisl furlher ZHOVO- l t" I the typewriler of of moving said Frames against ll r drsires lo use the :Hl l V1 1 1 I'Sl pushes l'iH oul ion or rel se lho shoulder 55 1 s1) ll (ii) then lil'ls lho i "1.) releasing ihe arm (51 11nd perimlimg 'hel'rxuues '56 and in rise to {he upper uovouiunl. The udder (11"- ill f pushed lowiird lhe righi by re nil iou l?) as l nk as ll" Wlll til into 3 ol lhe knob 19 nhuls against g l isllili', and stops the mmeif in mesh with l 11mm 3 sh no iwrm JOWD, the :Lddiu hruenl :irried h :2 ovided with six mmpullrg heels, hut 59 irged upii'ord h r sprir ih-re may. oi eourse, be any desired nuiiiher so 1 r go A ion it will not: of su l1 wheels.

for h. the operation oi the rid: u 1' Assume now ihiii lhe operiilor wishes to merit. The

d into such posil"- 1 lever 59 on of nun hers BGfOIQ Wl'lill] hull of us more is lvpowrnr-r marriage to \l' rid lOGliG iiiriLir-u. This would he tho posi oi the 'hieh he would sol his lahulnling i l misled dou' ll so he l 'pziu'riior were provided Willi lo 'ihe typewriter will l ii i110 number h in he who so iiumher 'ures nod in u mmihei szud iiuliui'i,---iiu' msl'om-e, if he :1 number wil'h three figures, 1 w 1I1'...4'l,, .,l .1n

no mourn u-piess [do some m .-i o r \e rypev er shrew tunes, so as to rouse (he lypewriler carriage in come (0 proper posu lion for wririug the first figure ol' the numher having to ovgvm oolween the Jr 5:) to nor- :1. position event movement sai engage the carriage to the proper posiliou {1S hereinheiore described, he would depress lhenumerol key vcl irh is used for writing; the figure 1. This would cause the figure 1 to be Wrilien in the usual manner, and the de 'iression of the hey lever 10 would cause it to engage the eorresporuliiur pin 44 ml the fl'zlll'h 36, which pin of such leugih ihzil rho pinion 30 would 0 related through 3 unit interval and muse the numeral 1 to appear upon the eorrbsponding wheel at the windoufia The down- Wz'ird movement of the key lever 10 would also depress the frame 26 through (he ongagenienl ol' the lever 10 -with the rod 45, and us he frame 26 approaches the lower limit of iis u'ro'vement, the shoulder 28 on the or the'eperi irough Wl'iioh the shank of the button 5? operates. The eug'lh of the spring 62 is insuflioient to overcome ll 0 irietion between the del ht 5S and the sh rder which it engages, and the lever 59 therefore remains depressed and he a m 61, holding the frames 2,110. 3' I link zrhuis against the arm 24 and shifts lowerhnu't ofn'love'ment, and there he )rrwl 20 so that the front ill 11 thereof are in staggered relation to each other, the

spring 18 thereupon advances the carriage one-half of the space interval. As soon as the key 1 is released, the frames 26 and 36 are drawn upward by their springs. This movement through the action of the rack 34 returns the pinion to its normal initial position while it is in an intermediate posi- "tion and out of mesh with any ol' the gear trains of the computing wheels. As the frame 26 approaches the upper limit of its movement, the shoulder 27 strikes the arm 24 and rocks the escapement pawl 20 forward so as to bring its rearward arm into engagement with the next tooth 22, and the carriage 17 again advances another halt step, bringing the master pinion 30 into mesh with the next gear train, which under the circumstances assumed is l'ourth from the left of Fig. 1. The operator next depresses the keyb which the numeral 6 is written. This in si ilar manner causes the master pinion B0 to rotate six unit intervals, and causes the second counting wheel from the right to indicate 6 at the .vindow 54. It also causes the operation of the spacing escapeine'nts botlLof the typewriter and the adding attachment so that the carriages shift to the position for writing and adding the last figure oi the number. depresses the 0 key, which causes th writing of the numeral 0 by the typewriter and causes the escapement of the carriages in the manner hereinbei ore described, but, as there is no pin 44 corresponding to the 0 key, the master pinion 30 is not rotated, and no change is made in the position of the count ing wheel of lowest dcnon'iination. The platen roller of the typewriter is then ad.- vanccd so as to write the succeeding number, the typewriter carriage is set to proper posi tion, and the adder carriage is pushed to the right to the limit of its movement. The next number is written in a similar manner, the space bar bcing operated until the carriages come into position for writing the first numeral of the nunibcr.

ill the numl'crs are being written in a. row,

instead ol in a colunm, the adder carriage 1s set by hand to bring it into position for operating the wheel ol' proper denomination, and in other respects the operation is as hereinbefore described.

'lhesum of all of the numbers written applhrs at the window 54, and when the operator writes this sum he reads it from the computing wheels at the window 54. Previous to writing the total, he pushes inward the knob 67 on the slide 3?), so as to shift the rack which is used for subtracting into mesh with the pinion 32, and then as each numeral of the sum is written, the counting wheel o The opm'ator finally corresponding denomination is turned backward a corresponding'number of unit intervals, and accordingly registers Q at the window 54. The act of writing the total thus resets the computing device to zero. After having written the total, the operator depresses the knob 68 which releases the slide 37 and allows it to return the member 34 so that theteetliwhichcause adding are brought into mesh with the pinion 32.

Although but one specific embodiment of this invention is herein illustrated, itiwill be understood that numerous details of the construction shown may be altered. without departing from the spirit of this invention.

1 claim: v

1.' in a device of the class described, the combination of a computing mechanism comprising aplurality of computing wheels, mec ianisrn connecting adjacent pairs of said wheels and ada ted to carry the count from one wheel to t e next, individual gears for operating the respective computing wheels, a master pinion adapted to mesh with either of said individual gears, a carriage arranged to relatively shift said computing mechanism and master pinion, a series of ivoted numeral key levers, a pair of movab e members, each pivoted on an axis parallel with the axes of the key levers, one of said members extending across the paths of said numeral key levers,' escapement mechanism operated by said one member and adapted to shift said carriage one interval so as to carry said master pinion into mesh with the next succeeding computing wheel gear through the movement of any of said numeral key levers,- shoulders on the other of said members being so disposed withrespect to the respective key levers as to cause said other member to beshiftcd a distance proportionate to the num her-of units in the numeral to which said key lever corresponds, and mechanism operated by said second member for rotating said master pinion through an angular interval proportionate to the movement of said second member.

2. The combination of a typewriter, a typewriter carriage, an adding attachment mounted on the typewriter independent of the carriage thereof and comprising a series of computing wheels, a master mechanism adapted to individu'all rotate said wheels, an adder carriage a; apted to shilt said wheels and master mechanism relatively to each other for causing the individual operation of dill'erent computing wheels, a series of numeral keys each adapted to operate said master mechanism to an extent proportionate to the numeral to which such key corresponds, mechanism independent of the typewriter carriage for successively shiftiin said adder carriage through the operation oi eaeh otsaid numeral keys, a space bar for shifting f i said typewriter carriage, and mechanism options through corresponding movements of said reciprocating member, within which said member adapted to be shifted alternately into mesh with s ion at will, means normallv urging said guide frame toward one limit of guide frame is slldable and its movement, a

with teeth located in staggered relation to each other, a escapcmcnt pawl arranged to alternately engage said racks for permitting a step by step movement of said carriage, one ol said racks being in such relation with said carriage and said eseapemcnt pawl as iostop said carriage in successive positions which bring said master mechanism into operative relation ith successively diilerent f computing wheels, and the other rack having to hold said (5 j ing to intermediate for carrying said racks aid second pinsuch relation with said pawl and carriage as arriag'e in positions correspomlpositions of said master it is out of operative computing wheels, and

mechanism wherein relation with said f means connecting said escapement mechandetent adapted to secure said guide frame at the other limit of adapted to withdraw said detent.

4. The combination of a series oi computing wheels, rack .and pinion master inechanism for operatiiw them individually, a carriage'for relatively shitting said wheels and master mechanism, a. series of numeral keys, a member movable to a respectively dill'erent extent by each of said keys and adapted to proportionately move said master mechanism, a second member adapted to be moved by each of said keys and controlling the shifting of said carriage, and means operated by said second member and adapted to limit the movement ol said master mechanism and thereby prevent overthrow of the computing wheels through violent operation of said keys.

5. The combination of a series of computing wheels, rack and pinion master mechanism i'or operating them individually, a carriage for relatively shifting said wheels and master mechanism, a series of numeral keys.-

a member movable to a respectively dill'erent extent by each of said keys and adapted to proportionately move said master mechanism, a second member ada ated to be moved by each of said keys and controlling .the shifting of said carriage, and a movable detent connected with said secondiniember and adapted to engage said master mechanism when said second member has been moved to a certain predetermined osition and thereby prevent overthrow of tie computing wheels through violent operation of said keys.

(5. The combination of a series of computing wheels, a master mechanism adapted to individually operate said wheels, a carriage for causing said master mec-hansim to be successively brought into operative relation with di'll'erent wheels of said series, a series of numeral keys, each adapted to operate said ma ter mechanism, means normally urging St master mechanism to a certain normal initial pos escapement mechanism comprising two ZdC-bIS provided its movement, and a key 5 l l i l g ism with said master mechanism so as to permit said carriage to shift only while said master mechanism is at one of the limits of its movement.

7. in a device ol the class described, the combination of a supporting frame, a carriage movably mounted on said frame, means normally urging saidrarriage in one direction, escapement mechanism comprising a pair ol' racks having teeth in staggered relation to each other and a reciprocating pawl movable alternately into engagement with said racks to permit the step by step escapemcnt of said carriage, a key inovably mounted in said frame, a member mounted to reciprocate in said frame, being adapted when engaged by said key to be shifted in one direction, means normally urging said member to a certain normal initial position, and means connecting said member with said escapcment mechanism, whereby said pawl will be shifted from one rack to the other when said member arrives at each limit of its movement and whereby said pawl will remain in lixed relation to said racks during internn-diate positions of said mcml 8. in a device of the class described, the combination of a carriage, a pair-of racks connected in lixed relation therewith, means normally urging said carriage in one direction, an escape-merit pawl for causing the step by step escapement of said carriage in the opposite direction, said pawl being pivotally mounted and adapted to oscillate between positions for alternately engaging said-I racks, an oscillating member, a link interposed between said oscillating member and pawl and having sliding connect-ion with one of them, and shoulders on said link adapted to limit its sliding movement for causing said pawl to be shifted by said member as said member approaches opposite limits of its movement, but to remain sta tionary at intermediate. positions of said member.

9. The combination of a series of 001m puting wheels, rack and pinion master mechanism for operating them individually,

a carriage for relatively shifting said wheels l said members into and out of range of said 1( and master mechanism, a series of numeral keys. v

ke s, a member movable to a res eetively Signed at Chicago this 12th day of Nodi erent extent by each of said l cys and vomhor', 190R.

ada ted to proportionately move said master mec anism, a second member adapted to be moved by each of said keys and control- Witnesses: ling the shifting of said carriage, and means EUGENE A. RUMMLER, adapted to imultaneouely throw both oi MARY ;\l.'l)ILL1\rAN.

CHARLES H. GILL. 

